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Physics

Physics
The unit of noise pollution (level) is :

Decibel
Ppm
Decimal
None of these

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Physics
Which of the following group of elements are diamagnetic?

Hydrogen, argon, copper
Oxygen, copper, silver
Argon, copper, silver
Hydrogen, oxygen, Argon

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Physics
Stars in the sky appear to twinkle due to

Multiple diminishing brightness
A series of refractions
A series of reflections
A surface tension phenomenon

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Physics
The weight of a body acts through the centre of

Gravity
Both (A) and (B)
Buoyancy
Mass

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Physics
A transformer works on the principle of

Generator
Inverter
Mutual induction
Self induction

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Physics
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

4
0.05
2
0.1

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